[Raithen]

A few pointers that I have.
My gameplay involves pressure that has guarenteed pay offs.
ZvT you can go for a 2 base +1 carapace roach timing that you drone behind, guarenteed to snipe a few buildings, reduce their army, get some scv's. It has to hit before siege tanks, you can take a third behind it.

ZvP same thing, do the whole stephano build but when you confirm FFE take a gas, get a roach den, move out with about 5 roaches, take your third and drone up behind it.
These 5 roaches WILL kill the forge/core/units. Worse case you equalise and game goes on as normal.
If they are going for a proxy, or a 2 base timing, or something early you counter them and win right there.

The immo-sentry push, you will identify it easily by basic scouting, get a 4th macro hatch and get a queen to inject it while its building. This allows you to get enough lings out for it. Start engaging as they move out to get those forcefields and yes throw down some extra spines. Use some of the lings to do a run by and make them have no follow up.

I'll get some replays and try to give you my exact timings (anyone who knows my play knows my timings are freakin wierd).